Commit | Line | Data |
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788b1fc6 AV |
1 | /* |
2 | * Real Time Clock interface for Linux on Atmel AT91RM9200 | |
3 | * | |
4 | * Copyright (C) 2002 Rick Bronson | |
5 | * | |
6 | * Converted to RTC class model by Andrew Victor | |
7 | * | |
8 | * Ported to Linux 2.6 by Steven Scholz | |
9 | * Based on s3c2410-rtc.c Simtec Electronics | |
10 | * | |
11 | * Based on sa1100-rtc.c by Nils Faerber | |
12 | * Based on rtc.c by Paul Gortmaker | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/rtc.h> | |
26 | #include <linux/bcd.h> | |
27 | #include <linux/interrupt.h> | |
e9f08bbe | 28 | #include <linux/spinlock.h> |
788b1fc6 AV |
29 | #include <linux/ioctl.h> |
30 | #include <linux/completion.h> | |
14070ade | 31 | #include <linux/io.h> |
7c1b68d4 JE |
32 | #include <linux/of.h> |
33 | #include <linux/of_device.h> | |
8ecc0bf4 | 34 | #include <linux/uaccess.h> |
fb0d4ec4 | 35 | |
75984df0 | 36 | #include "rtc-at91rm9200.h" |
d73e3cd7 | 37 | |
d28bdfc5 JCPV |
38 | #define at91_rtc_read(field) \ |
39 | __raw_readl(at91_rtc_regs + field) | |
40 | #define at91_rtc_write(field, val) \ | |
41 | __raw_writel((val), at91_rtc_regs + field) | |
788b1fc6 | 42 | |
788b1fc6 AV |
43 | #define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ |
44 | ||
de645475 | 45 | struct at91_rtc_config { |
e9f08bbe | 46 | bool use_shadow_imr; |
de645475 JH |
47 | }; |
48 | ||
49 | static const struct at91_rtc_config *at91_rtc_config; | |
788b1fc6 AV |
50 | static DECLARE_COMPLETION(at91_rtc_updated); |
51 | static unsigned int at91_alarm_year = AT91_RTC_EPOCH; | |
d28bdfc5 JCPV |
52 | static void __iomem *at91_rtc_regs; |
53 | static int irq; | |
e9f08bbe JH |
54 | static DEFINE_SPINLOCK(at91_rtc_lock); |
55 | static u32 at91_rtc_shadow_imr; | |
788b1fc6 | 56 | |
e304fcd0 JH |
57 | static void at91_rtc_write_ier(u32 mask) |
58 | { | |
e9f08bbe JH |
59 | unsigned long flags; |
60 | ||
61 | spin_lock_irqsave(&at91_rtc_lock, flags); | |
62 | at91_rtc_shadow_imr |= mask; | |
e304fcd0 | 63 | at91_rtc_write(AT91_RTC_IER, mask); |
e9f08bbe | 64 | spin_unlock_irqrestore(&at91_rtc_lock, flags); |
e304fcd0 JH |
65 | } |
66 | ||
67 | static void at91_rtc_write_idr(u32 mask) | |
68 | { | |
e9f08bbe JH |
69 | unsigned long flags; |
70 | ||
71 | spin_lock_irqsave(&at91_rtc_lock, flags); | |
e304fcd0 | 72 | at91_rtc_write(AT91_RTC_IDR, mask); |
e9f08bbe JH |
73 | /* |
74 | * Register read back (of any RTC-register) needed to make sure | |
75 | * IDR-register write has reached the peripheral before updating | |
76 | * shadow mask. | |
77 | * | |
78 | * Note that there is still a possibility that the mask is updated | |
79 | * before interrupts have actually been disabled in hardware. The only | |
80 | * way to be certain would be to poll the IMR-register, which is is | |
81 | * the very register we are trying to emulate. The register read back | |
82 | * is a reasonable heuristic. | |
83 | */ | |
84 | at91_rtc_read(AT91_RTC_SR); | |
85 | at91_rtc_shadow_imr &= ~mask; | |
86 | spin_unlock_irqrestore(&at91_rtc_lock, flags); | |
e304fcd0 JH |
87 | } |
88 | ||
89 | static u32 at91_rtc_read_imr(void) | |
90 | { | |
e9f08bbe JH |
91 | unsigned long flags; |
92 | u32 mask; | |
93 | ||
94 | if (at91_rtc_config->use_shadow_imr) { | |
95 | spin_lock_irqsave(&at91_rtc_lock, flags); | |
96 | mask = at91_rtc_shadow_imr; | |
97 | spin_unlock_irqrestore(&at91_rtc_lock, flags); | |
98 | } else { | |
99 | mask = at91_rtc_read(AT91_RTC_IMR); | |
100 | } | |
101 | ||
102 | return mask; | |
e304fcd0 JH |
103 | } |
104 | ||
788b1fc6 AV |
105 | /* |
106 | * Decode time/date into rtc_time structure | |
107 | */ | |
e7a8bb12 AM |
108 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
109 | struct rtc_time *tm) | |
788b1fc6 AV |
110 | { |
111 | unsigned int time, date; | |
112 | ||
113 | /* must read twice in case it changes */ | |
114 | do { | |
d28bdfc5 JCPV |
115 | time = at91_rtc_read(timereg); |
116 | date = at91_rtc_read(calreg); | |
117 | } while ((time != at91_rtc_read(timereg)) || | |
118 | (date != at91_rtc_read(calreg))); | |
788b1fc6 | 119 | |
fe20ba70 AB |
120 | tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0); |
121 | tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8); | |
122 | tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16); | |
788b1fc6 AV |
123 | |
124 | /* | |
125 | * The Calendar Alarm register does not have a field for | |
126 | * the year - so these will return an invalid value. When an | |
25985edc | 127 | * alarm is set, at91_alarm_year will store the current year. |
788b1fc6 | 128 | */ |
fe20ba70 AB |
129 | tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */ |
130 | tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */ | |
788b1fc6 | 131 | |
fe20ba70 AB |
132 | tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ |
133 | tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1; | |
134 | tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24); | |
788b1fc6 AV |
135 | } |
136 | ||
137 | /* | |
138 | * Read current time and date in RTC | |
139 | */ | |
140 | static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) | |
141 | { | |
142 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); | |
143 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
144 | tm->tm_year = tm->tm_year - 1900; | |
145 | ||
6588208c | 146 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
147 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
148 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
149 | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Set current time and date in RTC | |
155 | */ | |
156 | static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) | |
157 | { | |
158 | unsigned long cr; | |
159 | ||
6588208c | 160 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
161 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
162 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
163 | |
164 | /* Stop Time/Calendar from counting */ | |
d28bdfc5 JCPV |
165 | cr = at91_rtc_read(AT91_RTC_CR); |
166 | at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); | |
788b1fc6 | 167 | |
e304fcd0 | 168 | at91_rtc_write_ier(AT91_RTC_ACKUPD); |
e7a8bb12 | 169 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
e304fcd0 | 170 | at91_rtc_write_idr(AT91_RTC_ACKUPD); |
788b1fc6 | 171 | |
d28bdfc5 | 172 | at91_rtc_write(AT91_RTC_TIMR, |
fe20ba70 AB |
173 | bin2bcd(tm->tm_sec) << 0 |
174 | | bin2bcd(tm->tm_min) << 8 | |
175 | | bin2bcd(tm->tm_hour) << 16); | |
788b1fc6 | 176 | |
d28bdfc5 | 177 | at91_rtc_write(AT91_RTC_CALR, |
fe20ba70 AB |
178 | bin2bcd((tm->tm_year + 1900) / 100) /* century */ |
179 | | bin2bcd(tm->tm_year % 100) << 8 /* year */ | |
180 | | bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ | |
181 | | bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ | |
182 | | bin2bcd(tm->tm_mday) << 24); | |
788b1fc6 AV |
183 | |
184 | /* Restart Time/Calendar */ | |
d28bdfc5 JCPV |
185 | cr = at91_rtc_read(AT91_RTC_CR); |
186 | at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); | |
788b1fc6 AV |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Read alarm time and date in RTC | |
193 | */ | |
194 | static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
195 | { | |
196 | struct rtc_time *tm = &alrm->time; | |
197 | ||
198 | at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); | |
199 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
200 | tm->tm_year = at91_alarm_year - 1900; | |
201 | ||
e304fcd0 | 202 | alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM) |
a2db8dfc DB |
203 | ? 1 : 0; |
204 | ||
6588208c | 205 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
206 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
207 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
208 | |
209 | return 0; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Set alarm time and date in RTC | |
214 | */ | |
215 | static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
216 | { | |
217 | struct rtc_time tm; | |
218 | ||
219 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); | |
220 | ||
221 | at91_alarm_year = tm.tm_year; | |
222 | ||
eb3c2272 LP |
223 | tm.tm_mon = alrm->time.tm_mon; |
224 | tm.tm_mday = alrm->time.tm_mday; | |
788b1fc6 AV |
225 | tm.tm_hour = alrm->time.tm_hour; |
226 | tm.tm_min = alrm->time.tm_min; | |
227 | tm.tm_sec = alrm->time.tm_sec; | |
228 | ||
e304fcd0 | 229 | at91_rtc_write_idr(AT91_RTC_ALARM); |
d28bdfc5 | 230 | at91_rtc_write(AT91_RTC_TIMALR, |
fe20ba70 AB |
231 | bin2bcd(tm.tm_sec) << 0 |
232 | | bin2bcd(tm.tm_min) << 8 | |
233 | | bin2bcd(tm.tm_hour) << 16 | |
788b1fc6 | 234 | | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); |
d28bdfc5 | 235 | at91_rtc_write(AT91_RTC_CALALR, |
fe20ba70 AB |
236 | bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ |
237 | | bin2bcd(tm.tm_mday) << 24 | |
788b1fc6 AV |
238 | | AT91_RTC_DATEEN | AT91_RTC_MTHEN); |
239 | ||
449321b3 | 240 | if (alrm->enabled) { |
d28bdfc5 | 241 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
e304fcd0 | 242 | at91_rtc_write_ier(AT91_RTC_ALARM); |
449321b3 | 243 | } |
5d4675a8 | 244 | |
6588208c | 245 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
246 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
247 | tm.tm_min, tm.tm_sec); | |
788b1fc6 AV |
248 | |
249 | return 0; | |
250 | } | |
251 | ||
16380c15 JS |
252 | static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
253 | { | |
6588208c | 254 | dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled); |
16380c15 JS |
255 | |
256 | if (enabled) { | |
d28bdfc5 | 257 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
e304fcd0 | 258 | at91_rtc_write_ier(AT91_RTC_ALARM); |
e24b0bfa | 259 | } else |
e304fcd0 | 260 | at91_rtc_write_idr(AT91_RTC_ALARM); |
16380c15 JS |
261 | |
262 | return 0; | |
263 | } | |
788b1fc6 AV |
264 | /* |
265 | * Provide additional RTC information in /proc/driver/rtc | |
266 | */ | |
267 | static int at91_rtc_proc(struct device *dev, struct seq_file *seq) | |
268 | { | |
e304fcd0 | 269 | unsigned long imr = at91_rtc_read_imr(); |
e24b0bfa | 270 | |
e7a8bb12 | 271 | seq_printf(seq, "update_IRQ\t: %s\n", |
e24b0bfa | 272 | (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); |
e7a8bb12 | 273 | seq_printf(seq, "periodic_IRQ\t: %s\n", |
e24b0bfa | 274 | (imr & AT91_RTC_SECEV) ? "yes" : "no"); |
788b1fc6 AV |
275 | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /* | |
280 | * IRQ handler for the RTC | |
281 | */ | |
7d12e780 | 282 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
788b1fc6 | 283 | { |
e7a8bb12 | 284 | struct platform_device *pdev = dev_id; |
788b1fc6 AV |
285 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
286 | unsigned int rtsr; | |
287 | unsigned long events = 0; | |
288 | ||
e304fcd0 | 289 | rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read_imr(); |
788b1fc6 AV |
290 | if (rtsr) { /* this interrupt is shared! Is it ours? */ |
291 | if (rtsr & AT91_RTC_ALARM) | |
292 | events |= (RTC_AF | RTC_IRQF); | |
293 | if (rtsr & AT91_RTC_SECEV) | |
294 | events |= (RTC_UF | RTC_IRQF); | |
295 | if (rtsr & AT91_RTC_ACKUPD) | |
296 | complete(&at91_rtc_updated); | |
297 | ||
d28bdfc5 | 298 | at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
788b1fc6 | 299 | |
ab6a2d70 | 300 | rtc_update_irq(rtc, 1, events); |
788b1fc6 | 301 | |
6588208c | 302 | dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__, |
788b1fc6 AV |
303 | events >> 8, events & 0x000000FF); |
304 | ||
305 | return IRQ_HANDLED; | |
306 | } | |
307 | return IRQ_NONE; /* not handled */ | |
308 | } | |
309 | ||
de645475 JH |
310 | static const struct at91_rtc_config at91rm9200_config = { |
311 | }; | |
312 | ||
bba00e59 JH |
313 | static const struct at91_rtc_config at91sam9x5_config = { |
314 | .use_shadow_imr = true, | |
315 | }; | |
316 | ||
de645475 JH |
317 | #ifdef CONFIG_OF |
318 | static const struct of_device_id at91_rtc_dt_ids[] = { | |
319 | { | |
320 | .compatible = "atmel,at91rm9200-rtc", | |
321 | .data = &at91rm9200_config, | |
bba00e59 JH |
322 | }, { |
323 | .compatible = "atmel,at91sam9x5-rtc", | |
324 | .data = &at91sam9x5_config, | |
de645475 JH |
325 | }, { |
326 | /* sentinel */ | |
327 | } | |
328 | }; | |
329 | MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids); | |
330 | #endif | |
331 | ||
332 | static const struct at91_rtc_config * | |
333 | at91_rtc_get_config(struct platform_device *pdev) | |
334 | { | |
335 | const struct of_device_id *match; | |
336 | ||
337 | if (pdev->dev.of_node) { | |
338 | match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node); | |
339 | if (!match) | |
340 | return NULL; | |
341 | return (const struct at91_rtc_config *)match->data; | |
342 | } | |
343 | ||
344 | return &at91rm9200_config; | |
345 | } | |
346 | ||
ff8371ac | 347 | static const struct rtc_class_ops at91_rtc_ops = { |
788b1fc6 AV |
348 | .read_time = at91_rtc_readtime, |
349 | .set_time = at91_rtc_settime, | |
350 | .read_alarm = at91_rtc_readalarm, | |
351 | .set_alarm = at91_rtc_setalarm, | |
352 | .proc = at91_rtc_proc, | |
16380c15 | 353 | .alarm_irq_enable = at91_rtc_alarm_irq_enable, |
788b1fc6 AV |
354 | }; |
355 | ||
356 | /* | |
357 | * Initialize and install RTC driver | |
358 | */ | |
359 | static int __init at91_rtc_probe(struct platform_device *pdev) | |
360 | { | |
361 | struct rtc_device *rtc; | |
d28bdfc5 JCPV |
362 | struct resource *regs; |
363 | int ret = 0; | |
788b1fc6 | 364 | |
de645475 JH |
365 | at91_rtc_config = at91_rtc_get_config(pdev); |
366 | if (!at91_rtc_config) | |
367 | return -ENODEV; | |
368 | ||
d28bdfc5 JCPV |
369 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
370 | if (!regs) { | |
371 | dev_err(&pdev->dev, "no mmio resource defined\n"); | |
372 | return -ENXIO; | |
373 | } | |
374 | ||
375 | irq = platform_get_irq(pdev, 0); | |
376 | if (irq < 0) { | |
377 | dev_err(&pdev->dev, "no irq resource defined\n"); | |
378 | return -ENXIO; | |
379 | } | |
380 | ||
f3766250 SK |
381 | at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start, |
382 | resource_size(regs)); | |
d28bdfc5 JCPV |
383 | if (!at91_rtc_regs) { |
384 | dev_err(&pdev->dev, "failed to map registers, aborting.\n"); | |
385 | return -ENOMEM; | |
386 | } | |
387 | ||
388 | at91_rtc_write(AT91_RTC_CR, 0); | |
389 | at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */ | |
788b1fc6 AV |
390 | |
391 | /* Disable all interrupts */ | |
e304fcd0 | 392 | at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
393 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
394 | AT91_RTC_CALEV); | |
788b1fc6 | 395 | |
f3766250 | 396 | ret = devm_request_irq(&pdev->dev, irq, at91_rtc_interrupt, |
dac94d9e | 397 | IRQF_SHARED, |
d728b1e6 | 398 | "at91_rtc", pdev); |
788b1fc6 | 399 | if (ret) { |
6588208c | 400 | dev_err(&pdev->dev, "IRQ %d already in use.\n", irq); |
f3766250 | 401 | return ret; |
788b1fc6 AV |
402 | } |
403 | ||
5d4675a8 DB |
404 | /* cpu init code should really have flagged this device as |
405 | * being wake-capable; if it didn't, do that here. | |
406 | */ | |
407 | if (!device_can_wakeup(&pdev->dev)) | |
408 | device_init_wakeup(&pdev->dev, 1); | |
409 | ||
f3766250 | 410 | rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
e7a8bb12 | 411 | &at91_rtc_ops, THIS_MODULE); |
f3766250 SK |
412 | if (IS_ERR(rtc)) |
413 | return PTR_ERR(rtc); | |
788b1fc6 AV |
414 | platform_set_drvdata(pdev, rtc); |
415 | ||
6588208c | 416 | dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n"); |
788b1fc6 AV |
417 | return 0; |
418 | } | |
419 | ||
420 | /* | |
421 | * Disable and remove the RTC driver | |
422 | */ | |
5d4675a8 | 423 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
788b1fc6 | 424 | { |
788b1fc6 | 425 | /* Disable all interrupts */ |
e304fcd0 | 426 | at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
427 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
428 | AT91_RTC_CALEV); | |
788b1fc6 AV |
429 | |
430 | return 0; | |
431 | } | |
432 | ||
51a0d036 JH |
433 | static void at91_rtc_shutdown(struct platform_device *pdev) |
434 | { | |
435 | /* Disable all interrupts */ | |
436 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | | |
437 | AT91_RTC_SECEV | AT91_RTC_TIMEV | | |
438 | AT91_RTC_CALEV); | |
439 | } | |
440 | ||
6975a9c1 | 441 | #ifdef CONFIG_PM_SLEEP |
788b1fc6 AV |
442 | |
443 | /* AT91RM9200 RTC Power management control */ | |
444 | ||
e24b0bfa | 445 | static u32 at91_rtc_imr; |
788b1fc6 | 446 | |
dac94d9e | 447 | static int at91_rtc_suspend(struct device *dev) |
788b1fc6 | 448 | { |
90b4d648 DB |
449 | /* this IRQ is shared with DBGU and other hardware which isn't |
450 | * necessarily doing PM like we are... | |
451 | */ | |
e304fcd0 | 452 | at91_rtc_imr = at91_rtc_read_imr() |
e24b0bfa JH |
453 | & (AT91_RTC_ALARM|AT91_RTC_SECEV); |
454 | if (at91_rtc_imr) { | |
455 | if (device_may_wakeup(dev)) | |
d28bdfc5 | 456 | enable_irq_wake(irq); |
e24b0bfa | 457 | else |
e304fcd0 | 458 | at91_rtc_write_idr(at91_rtc_imr); |
e24b0bfa | 459 | } |
788b1fc6 AV |
460 | return 0; |
461 | } | |
462 | ||
dac94d9e | 463 | static int at91_rtc_resume(struct device *dev) |
788b1fc6 | 464 | { |
e24b0bfa JH |
465 | if (at91_rtc_imr) { |
466 | if (device_may_wakeup(dev)) | |
d28bdfc5 | 467 | disable_irq_wake(irq); |
e24b0bfa | 468 | else |
e304fcd0 | 469 | at91_rtc_write_ier(at91_rtc_imr); |
90b4d648 | 470 | } |
788b1fc6 AV |
471 | return 0; |
472 | } | |
788b1fc6 AV |
473 | #endif |
474 | ||
6975a9c1 JH |
475 | static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume); |
476 | ||
788b1fc6 | 477 | static struct platform_driver at91_rtc_driver = { |
5d4675a8 | 478 | .remove = __exit_p(at91_rtc_remove), |
51a0d036 | 479 | .shutdown = at91_rtc_shutdown, |
788b1fc6 AV |
480 | .driver = { |
481 | .name = "at91_rtc", | |
482 | .owner = THIS_MODULE, | |
6975a9c1 | 483 | .pm = &at91_rtc_pm_ops, |
7c1b68d4 | 484 | .of_match_table = of_match_ptr(at91_rtc_dt_ids), |
788b1fc6 AV |
485 | }, |
486 | }; | |
487 | ||
ac36960f | 488 | module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe); |
788b1fc6 AV |
489 | |
490 | MODULE_AUTHOR("Rick Bronson"); | |
491 | MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); | |
492 | MODULE_LICENSE("GPL"); | |
ad28a07b | 493 | MODULE_ALIAS("platform:at91_rtc"); |